Why can't I change elements from a linq IEnumerable in a for loop?

Question

Yesterday I wrote the following c# code (shortened a bit for legibility):

 var timeObjects = ( from obj in someList
                     where ( obj.StartTim         


        

Answer 1

Your original timeObjects definition defines a LINQ expression that gets lazily evaluated, so everytime you try to go over the timeObjects enumerable, it will create new instances of MyObject.